The move to make your smartphone your room key is now widespread, but over at Starwood Hotels first, that is. The hotel chain is introducing a new app-powered, keyless-entry program. You'd better not lose your phone!

All you need to do is download the SPG key, and you are given a Bluetooth key to enable the keyless entry feature.

The feature will be available on November 5 at 10 Starwood Hotels around the world:

Aloft Beijing, Aloft Cancun, Aloft Cupertino, Aloft Harlem, W Doha, W Hollywood, W Hong Kong, W New York-Downtown, W Singapore and Element Times Square

They plan to make this available to 150 hotels by early 2015.

Check out a video below: